PriorityBlockingQueue clear() method in Java

Last Updated : 26 Nov, 2018

The clear() method of PriorityBlockingQueue removes all the elements from this queue. Therefore this method can be applied when it is required to clear the PriorityBlockingQueue. Syntax:

public void clear()

Parameter: This method takes no parameters. Returns: This method returns nothing. Exception: This method does not throw any Exception. Below program illustrate removing all the elements from PriorityBlockingQueue using clear() method. Example 1:

Java

// Java Program to Demonstrate clear() method // of PriorityBlockingQueue.  import java.util.concurrent.PriorityBlockingQueue;  public class GFG {      public static void main(String[] args)     {         // define capacity of PriorityBlockingQueue         int capacity = 15;          // create object of PriorityBlockingQueue         PriorityBlockingQueue<Integer> PrioBlockingQueue             = new PriorityBlockingQueue<Integer>(capacity);          // add numbers         PrioBlockingQueue.add(78758575);         PrioBlockingQueue.add(63447688);         PrioBlockingQueue.add(56434788);          // print queue after add operation         System.out.println("After Adding  Numbers:");         System.out.println("PriorityBlockingQueue:"                            + PrioBlockingQueue);          // remove all the elements using clear() method         PrioBlockingQueue.clear();          // print queue after clear operation         System.out.println("\nAfter clear operation:");         System.out.println("PriorityBlockingQueue:"                            + PrioBlockingQueue);     } }

Output:

  After Adding  Numbers:  PriorityBlockingQueue:[56434788, 78758575, 63447688]    After clear operation:  PriorityBlockingQueue:[]

Example 2: To illustrate clear method on a PriorityBlockingQueue which contains a list of names.

Java

// Java Program to Demonstrate clear() method // of PriorityBlockingQueue.  import java.util.concurrent.PriorityBlockingQueue;  public class GFG {      public static void main(String[] args)     {         // define capacity of PriorityBlockingQueue         int capacity = 15;          // create object of PriorityBlockingQueue         PriorityBlockingQueue<String> PrioBlockingQueue             = new PriorityBlockingQueue<String>(capacity);          // add some names         PrioBlockingQueue.add("Tandrima");         PrioBlockingQueue.add("Argha");         PrioBlockingQueue.add("Arka");          // print queue after add operation         System.out.println("List of Names:");         System.out.println("PriorityBlockingQueue: "                            + PrioBlockingQueue);          // remove all the elements using clear() method         PrioBlockingQueue.clear();          // print queue after clear operation         System.out.println("\nAfter clearing List of names:");         System.out.println("PriorityBlockingQueue:"                            + PrioBlockingQueue);     } }

Output:

  List of Names:  PriorityBlockingQueue: [Argha, Tandrima, Arka]    After clearing List of names:  PriorityBlockingQueue:[]

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/PriorityBlockingQueue.html#clear--

PriorityBlockingQueue clear() method in Java

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PriorityBlockingQueue clear() method in Java

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